. >> the city for the sfpuc, it was critical that the building stay as a lead building. the easiest thing to do to cut out millions of dollars, let's just go from lead platinum to lead gold. but that wasn't the objective. this needed to be the best example of energy conservation of any office building in the united states. >> we became involved in the san francisco public utilities headquarter project during the time when the project was at a stand still for a number of reasons, largely due to budget issues. and at the time we were asked to consider an alternative design using concrete rather than the scheme that was potentially planned for previous to that, which was a steel frame structure that used hydraulic dampers to control seismic motion. >> so, i met with my team. we worked hard. we came up with a great idea. let's take out the heavy steel structure, let's put in an innovative vertical post tension concrete structure, great idea. we did that. a lot of other things. and we came up with a price of 140 million. so, we achieved that goal. and, so, when we first start